My brother with his friends __If it __tomorrow.

问题描述:

My brother with his friends __If it __tomorrow.
1 are you to hike;doesn't rain 2 is going hiking ;doesn't rain
为什么不选一

关键在于找出这句话的主语
主语应该是my brother,with his friends只是个介词短语,所以主语是第三人称单数
如果是my brother and his friends,那就要用复数了